John Johnson’s review:

Saw this on youtube. This is a very good cold war era spy flick directed by John Houston, and featuring Orson Welles, and Richard Boone as well as the always great Max Von Sydow.

I believe this film might give some actual insight into how espionage is or was actually conducted. I haven't seen to much of anything Richard Boone has been in but see him in this and also "Hombre" with Paul Newman, a film also on my list. Boone is just as sinister as an ally as he is an enemy.